Here is a preview for a new SM64 level editor that I'm working on. I plan on releasing the tool this Friday (July 7th), when the summer C3 event starts.
More screenshots here:
http://imgur.com/a/OmXKZ
The main focus of the tool is to be like TT64, but with better ROM compatibility.
* Both extended ROMs and vanilla (8MB) ROMs that have uncompressed data can be modified.
* You can modify any of the 4 major regional versions of SM64, which includes: US, Europe, Japan, and Japan (Shindou edition)
* You can load and save ROM files as big endian(.z64), middle endian(.v64), or little endian(.n64)
* Supports most of the N64 texture formats: RGBA16, RGBA32, IA16, IA8, IA4, I8, and I4. (CI textures will be interpreted as grayscale)
Note: Macro & Special objects are not editable with the vanilla 8MB ROM, since they are MIO0 compressed. You can use queueRAM's sm64extend tool to extend any vanilla ROM file, which will let you edit these objects.
Only objects & warps will be editable in this first version. I'm planning on adding more features, like texture editing, in future updates down the line.